Origin and structure of granite.
Granite or granite is a common intrusive igneous rock composed of acid. Granite has a medium to coarse grain architecture, when there are larger crystals lying prominently in the rock, it is called porphia or rash. Granite is pink to dark gray or even black, depending on the chemical and mineral composition of the stone. Granite blocks are exposed on the ground in solid form and tend to be round and edge when weathered. Granite sometimes appears as circular basins surrounded by hills formed by metamorphic processes exposed to heat or keratinization. Granite: also known as granite, is a natural stone formed by the metamorphism of limestone, carbonate or dolomite. Metamorphic process of re-crystallizing these sedimentary rocks to form rock interlaced veins. - The average specific gravity is 2.75 g / cm3 - Granite comes from Latin as granum, meaning grain to refer to the rough grain structure of crystalline stone. - Granite blocks are crystallized from magma so they have composition close to eutectic point (or the lowest temperature on cotectic curve). Magma evolved in eutectic form by magma dispersion, or because of its low grade in part of molten magma. Fractional crystallization reduces the content of iron, magnesium, titanium, calcium and sodium, and enriches potassium and silicon. Alkaline fensapt (rich in potassium) and quartz are the two main components of granite.
The average percentage of mineral components in the world granite is graded as a percentage by mass in the following descending order: • SiO2 - 72.04% • Al2O3 - 14.42% • K2O - 4.12% • Na2O - 3.69% • CaO - 1.82% • FeO - 1.68% • Fe2O3 - 1.22% • MgO - 0.71% • TiO2 - 0.30% • P2O5 - 0.12% • MnO - 0.05%
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